howto / docs on getting views exposed filters working for webform submission data as select

There is a lot of info available (also outside of d.o) on how to get submission data exported (some of the most clear/authoritative ones are related issues.) A lot of it is for different versions of webform though it seems. From what I gather it is even possible using filters on specific submitted data fields (or webform components actually). Unfortunately I haven't been able to get it working, nor is there a handbook page for it (which I am willing to create and make screenshots for btw) but this might certainly clear up a lot of confusion.

I basically just want to export certain submissions based on a filter (as select) which can be set by an user.

I have tried many routes towards this. Webform report, which goes a long way but the report filters aren't editable by the user. So then I tried using views (problably with views data export or VBO to do actual exporting) and I tried the "webform mysql views / data" way which didn't quite work out.

So my latest steps using purely webform :

1. updating to webform 4.2 (or later) because of the views (integration) it provides
2. clone the 'Webform Submission' view
3. add the webform submission data: value as a views field to display. This works fine. The values show up in the table, just as they do in webform or the default webform page.
4. as explained in the related topics to be abe to use submission data as filters you first have to add a relationship to it. So I did relationship -> add -> webform submission: data -> select the node the webform is attached to -> -> select the field I am interested in.
5. Add a filter webform submmission data : data -> use the relation just created -> check 'expose' -> leave operator on 'equals' .
6. What I notice here is that for the value there is a textfield. Not a select list, nor checkboxes with the possible values for the select list.

After these steps I do see an exposed filter for the submission data/component. But it is a textfield and not a select list. Although the component used for the data is a select. Furthermore it doesn't work when searching for the values of the select, which ARE displayed correctly in the tabel beneath it. It just works when searching/filtering for the keys of the select, which isn't really useful as the end user does not know which these are. See screenshots.

So now I am a bit lost. What am I doing wrong? Or isn't it even possible what I am attempting here?
Would it be good idea to create a handbook page for this?